期刊
APPLIED ENERGY
卷 226, 期 -, 页码 797-807出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2018.04.098
关键词
Solar methane reforming; Thermochemical reactor; Cutoff wavelength coating; Compound parabolic concentrator; Efficiency
资金
- National Natural Science Foundation [51676189]
- Chinese Academy of Sciences International Collaboration Key Program [182211KYSB20160043]
- Chinese Academy of Sciences Frontier Science Key Research Project [QYZDYSSW-JSC036]
We report an efficiency-enhanced solar methane reforming reactor design, featuring cutoff wavelength coating over quartz window for incident solar energy, a compound parabolic concentrator (CPC) device for thermochemical performance enhancement and reticulated porous ceramics (RPC) structure of Ni/CeO2-ZrO2 used as the catalyst. A numerical model combining Monte-Carlo ray-tracing (MCRT) method with finite-element method (FEM) is established to evaluate the effectiveness of this reactor design. The simulation results show that the cutoff wavelength coating (with threshold wavelength of 2400 nm) helps to reduce 80% radiation heat loss from within the reactor at the cost of only 1% incident sunlight loss during transmission at a typical reforming temperature of 850 degrees C. The performance of the reactor is numerically investigated under different reaction conditions with wide ranges of temperature, solar power input and steam-to-methane ratio. Results show that eta(solar-chemical) (solar-to-chemical efficiency) can reach 39.98% and 59.16% without and with 90% heat recovery, respectively, and X-CH4 (methane conversion) is 83.95% at reforming temperature of 850 degrees C and pressure of 1 atm. The new reactor design could considerably increase the utilization efficiency of solar energy.
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